HHH-18490 Add test for issue

hibernate-core/src/test/java/org/hibernate/orm/test/metamodel/generics/embeddable/AbstractValueObject.java

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+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.metamodel.generics.embeddable;
+
+import java.io.Serializable;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.MappedSuperclass;
+
+@MappedSuperclass
+public abstract class AbstractValueObject<V extends Comparable<V>> implements Serializable,
+		Comparable<AbstractValueObject<V>> {
+	public static final String VALUE = "value";
+
+	@Column( name = "value_col" )
+	private V value;
+
+	protected AbstractValueObject() {
+		super();
+	}
+
+	protected AbstractValueObject(final V value) {
+		this.value = value;
+	}
+
+	@Override
+	public int compareTo(final AbstractValueObject<V> object) {
+		return value.compareTo( object.value );
+	}
+}

hibernate-core/src/test/java/org/hibernate/orm/test/metamodel/generics/embeddable/CreationDate.java

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+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.metamodel.generics.embeddable;
+
+import java.util.Date;
+
+import jakarta.persistence.Embeddable;
+
+@Embeddable
+public class CreationDate extends AbstractValueObject<Date> {
+	protected CreationDate() {
+		super();
+	}
+
+	public CreationDate(final Date value) {
+		super( value );
+	}
+}

hibernate-core/src/test/java/org/hibernate/orm/test/metamodel/generics/embeddable/GenericEmbeddableSuperclassMetamodelTest.java

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+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.metamodel.generics.embeddable;
+
+import java.util.Date;
+
+import org.hibernate.SessionFactory;
+
+import org.hibernate.testing.orm.junit.EntityManagerFactoryScope;
+import org.hibernate.testing.orm.junit.Jira;
+import org.hibernate.testing.orm.junit.Jpa;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Tuple;
+import jakarta.persistence.TypedQuery;
+import jakarta.persistence.criteria.CriteriaBuilder;
+import jakarta.persistence.criteria.CriteriaQuery;
+import jakarta.persistence.criteria.Expression;
+import jakarta.persistence.criteria.Path;
+import jakarta.persistence.criteria.Root;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Marco Belladelli
+ */
+@Jpa( annotatedClasses = {
+		Parent.class,
+		AbstractValueObject.class,
+		CreationDate.class,
+		SomeNumber.class,
+		SomeString.class,
+} )
+@Jira( "https://hibernate.atlassian.net/browse/HHH-18490" )
+public class GenericEmbeddableSuperclassMetamodelTest {
+	@SuppressWarnings( { "rawtypes", "unchecked" } )
+	@Test
+	public void test(EntityManagerFactoryScope scope) {
+		scope.inTransaction( entityManager -> {
+			final CriteriaBuilder cb = entityManager.getCriteriaBuilder();
+			final CriteriaQuery<Tuple> cq = cb.createTupleQuery();
+			final Root<Parent> from = cq.from( Parent.class );
+
+			final Path someStringPath = from.get( Parent_.someString ).get( SomeString_.value );
+			final Path someNumberPath = from.get( Parent_.someNumber ).get( SomeNumber_.value );
+			final Path timestampPath = from.get( Parent_.date ).get( CreationDate_.value );
+			final Expression<Integer> maxNumber = cb.max( someNumberPath );
+			final Expression<Date> maxTimestamp = cb.function( "max", Date.class, timestampPath );
+			cq.select( cb.tuple( someStringPath, maxTimestamp, maxNumber ) );
+			cq.groupBy( someStringPath );
+
+			final TypedQuery<Tuple> query = entityManager.createQuery( cq );
+			final Tuple result = query.getSingleResult();
+
+			assertThat( result.get( 0, String.class ) ).isEqualTo( "something" );
+			assertThat( result.get( 1, Date.class ) ).isNotNull();
+			assertThat( result.get( 2, Object.class ) ).isEqualTo( 42 );
+		} );
+	}
+
+	@BeforeAll
+	public void setUp(EntityManagerFactoryScope scope) {
+		scope.inTransaction( entityManager -> entityManager.persist( new Parent(
+				new SomeString( "something" ),
+				new CreationDate( new Date() ),
+				new SomeNumber( 42 )
+		) ) );
+	}
+
+	@AfterAll
+	public void tearDown(EntityManagerFactoryScope scope) {
+		scope.getEntityManagerFactory().unwrap( SessionFactory.class ).getSchemaManager().truncateMappedObjects();
+	}
+}

hibernate-core/src/test/java/org/hibernate/orm/test/metamodel/generics/embeddable/Parent.java

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+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.metamodel.generics.embeddable;
+
+import jakarta.persistence.AttributeOverride;
+import jakarta.persistence.Column;
+import jakarta.persistence.Embedded;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+
+import static org.hibernate.orm.test.metamodel.generics.embeddable.AbstractValueObject.VALUE;
+
+@Entity
+public class Parent {
+	@Id
+	@GeneratedValue
+	private Long id;
+
+	@Embedded
+	@AttributeOverride( name = VALUE, column = @Column( name = "some_string" ) )
+	private SomeString someString;
+
+	@Embedded
+	@AttributeOverride( name = VALUE, column = @Column( name = "some_date" ) )
+	private CreationDate date;
+
+	@Embedded
+	@AttributeOverride( name = VALUE, column = @Column( name = "some_number" ) )
+	private SomeNumber someNumber;
+
+	public Parent() {
+	}
+
+	public Parent(final SomeString someString, final CreationDate date, final SomeNumber someNumber) {
+		this.someString = someString;
+		this.date = date;
+		this.someNumber = someNumber;
+	}
+}

hibernate-core/src/test/java/org/hibernate/orm/test/metamodel/generics/embeddable/SomeNumber.java

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+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.metamodel.generics.embeddable;
+
+import jakarta.persistence.Embeddable;
+
+@Embeddable
+public class SomeNumber extends AbstractValueObject<Integer> {
+	protected SomeNumber() {
+	}
+
+	public SomeNumber(final Integer value) {
+		super( value );
+	}
+}

hibernate-core/src/test/java/org/hibernate/orm/test/metamodel/generics/embeddable/SomeString.java

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+package org.hibernate.orm.test.metamodel.generics.embeddable;
+
+import jakarta.persistence.Embeddable;
+
+@Embeddable
+public class SomeString extends AbstractValueObject<String> {
+	protected SomeString() {
+	}
+
+	public SomeString(final String value) {
+		super( value );
+	}
+}